PWM based motor speed control using LPC 1768
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This code configures the LPC1768 microcontroller's PWM peripheral to generate a pulse width modulated signal on pin PWM1.5. It initializes the PWM timer and match registers, enables the PWM output, and then uses a for loop to incrementally change the duty cycle of the PWM signal from 10% to 100% over 10 steps, pausing 1 second between each step. This allows the user to see the PWM output change frequency smoothly over time.
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PWM based motor speed control using LPC 1768
- 2. Code: #include<stdio.h> #include "LPC1768_Includes.h" void delay(unsigned int time) { unsigned int j=0,i=0; for (j=0;j<time;j++) for (i=0;i<20000;i++); } int main() { unsigned int periods=100000,i; PINSEL3=0x00020000; //PWM1.5 PCONP=1<<6; //PCPWM1 PWM1 power/clock control bit. PWM1CTCR=0x00000000; // Timer Mode, PCAP1.0, PWM1PR=0x0000; // Prescale Register. The TC is incremented every PR+1 cycles of PCLK PWM1MCR=0x00000002; //Reset on PWMMR0: the PWMTC will be reset if PWMMR0 matches it. PWM1MR0=periods; // Match Register 0. PWM1PCR=0x00002000; // The PWM5 output enabled. PWM1TCR=0X00000009; // PWM Timer Counter,PWM Prescale Counter enabled , PWM mode is enabled while(1) { for (i=10;i>0;i--) { PWM1MR5=i*periods/10; PWM1LER=0x00000020; //Enable PWM Match 5 Latch (writing 1)